/*
 * Copyright 2020, OpenTelemetry Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.opentelemetry.auto.util.gc;

import java.lang.ref.WeakReference;

public abstract class GCUtils {

  public static void awaitGC() throws InterruptedException {
    Object obj = new Object();
    final WeakReference<Object> ref = new WeakReference<>(obj);
    obj = null;
    awaitGC(ref);
  }

  public static void awaitGC(final WeakReference<?> ref) throws InterruptedException {
    while (ref.get() != null) {
      if (Thread.interrupted()) {
        throw new InterruptedException();
      }
      System.gc();
      System.runFinalization();
    }
  }
}
